Greenhouse temperature control system

Abstract

A greenhouse temperature control system comprises a heat storage water tank, a heat pump unit, a heating device and a geothermal pipeline. The heat storage water tank heating outlet is communicated with the heating device water inlet, and the heat storage water tank inlet is communicated with the heating device water outlet; a circulating pump is arranged on the heating outlet pipe; a temperature control outlet of the heat storage water tank communicates with an inlet of the heat pump unit, and a temperature control inlet of the heat storage water tank communicates with an outlet of the heat pump unit. Temperature sensors are arranged in the heat pump unit and the heat storage water tank; a plurality of heat pump circulating pump sets are arranged on the temperature control outlet pipe in parallel; each heat pump circulating pump set comprises a front end valve, a manual control valve, a heat pump circulating pump, a check valve and a rear end valve from the front end to the rear end. A valve is arranged on the temperature control inlet pipe; the heat storage water tank is further provided with a water outlet and a water inlet, the water outlet is communicated with an inlet of the geothermal pipeline in the greenhouse, the water inlet is communicated with an outlet of the geothermal pipeline in the greenhouse, and a circulating pump is arranged on a pipeline where the geothermal pipeline is communicated with the water inlet.

Description

Technical Field

[0001] The utility model relates to the technical field of planting, in particular to a greenhouse temperature control system. Background Art

[0002] With the country's strategy of improving agricultural quality and efficiency, equipment, intelligence, and dual carbon; new agricultural products have higher requirements for the control of the planting environment. Greenhouses are widely used in the planting of crops with high economic value. There are also many technical routes for greenhouse heating technology. The existing heating system mainly adopts three forms: boiler (natural gas, diesel), electric boiler, and air-cooled heat pump technology (including variable frequency heat pump), but the heat pump unit has the problem of attenuation under low temperature conditions.

[0003] In the operation state of the heat storage mode, if the control mode of producing domestic hot water is still used, it is not suitable for the control of the heat storage mode. The start and stop of the heat pump unit is determined by the temperature difference between the inlet and outlet water, that is, the outlet water temperature of the heat pump unit is 50℃, and the return water temperature is 45℃. When the inlet and outlet water temperature difference is lower than 4℃, the heat pump will start automatically. However, when the heat storage mode is running, when the temperature of the water tank reaches the set value, the unit will start automatically when the temperature difference of the water tank changes. When running for a long time, it will cause the unit to start frequently, causing damage to the unit and shortening the service life of the unit. Utility Model Content

[0004] In order to solve the above problems, the utility model provides the following solutions:

[0005] A greenhouse temperature control system comprises a hot water storage tank, a heat pump unit, a heating device and a geothermal pipe; the heating outlet of the hot water storage tank is connected with the water inlet of the heating device through a heating outlet pipe, and the inlet of the hot water storage tank is connected with the water outlet of the heating device through a heating inlet pipe; a circulating pump is arranged on the heating outlet pipe; the temperature control outlet of the hot water storage tank is connected with the inlet of the heat pump unit through a temperature control outlet pipe, and the temperature control inlet of the hot water storage tank is connected with the outlet of the heat pump unit through a temperature control inlet pipe; temperature sensors are arranged in the heat pump unit and the hot water storage tank; a plurality of heat pump circulation pump groups are arranged in parallel on the temperature control outlet pipe; each heat pump circulation pump group comprises a front valve, a manual control valve, a heat pump circulation pump, a check valve and a rear valve from the front end to the rear end; a valve is arranged on the temperature control inlet pipe; the hot water storage tank is also provided with a water outlet and a water inlet, the water outlet is connected with the inlet of the geothermal pipe in the greenhouse, the water inlet is connected with the outlet of the geothermal pipe in the greenhouse, and a circulating pump is arranged on the pipe connecting the geothermal pipe and the water inlet.

[0006] Furthermore, the manual control valve and the heat pump circulation pump, the heat pump circulation pump and the check valve, the rear end valve and the heat pump inlet, and the valve and the heat pump outlet are all connected through rubber flexible joints.

[0007] Furthermore, the valve, the front-end valve and the rear-end valve are all gate valves.

[0008] Furthermore, the heat pump unit is an air-cooled screw heat pump unit.

[0009] Furthermore, the heating device is a solar heating device.

[0010] Furthermore, the solar heating device includes a plurality of solar heating tube groups, each solar heating tube group includes 20 solar heating tubes.

[0011] Furthermore, there are two hot water storage tanks, and each hot water storage tank is connected to a group of heating devices.

[0012] Furthermore, the two hot water storage tanks are connected in parallel.

[0013] The beneficial effects of the utility model are:

[0014] 1. Add a hot water storage tank between the heat pump unit and the geothermal pipeline. The temperature buffer of the hot water storage tank can prevent the heat pump unit from increasing load when the temperature difference between the inlet and outlet water is too large, which will cause the unit to fail to maintain the best efficiency, effectively increase the practical life of the equipment, and effectively save energy consumption.

[0015] 2. Optimize the control logic through the temperature sensors installed in the hot water tank and the heat pump unit, rationally plan the operation time of the heat pump unit, and avoid energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the pipe connection of the utility model system;

[0017] Figure 2 It is a top view of the utility model.

[0018] In the figure: 1. Hot water storage tank; 2. Heat pump unit; 3. Heating device; 4. Heating outlet pipe; 5. Heating inlet pipe; 6. Circulation pump; 7. Temperature control outlet pipe; 8. Temperature control inlet pipe; 9. Front valve; 10. Manual control valve; 11. Heat pump circulation pump; 12. Check valve; 13. Rear valve; 14. Valve; 15. Rubber flexible joint; 16. Geothermal pipeline; 17. Heat pump circulation pump unit. DETAILED DESCRIPTION

[0019] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0020] Example 1: Figure 1-Figure 2 As shown,

[0021] A greenhouse temperature control system comprises a hot water storage tank 1, a heat pump unit 2, a heating device 3 and a geothermal pipe 16; the heating outlet of the hot water storage tank 1 is connected to the water inlet of the heating device 3 through a heating outlet pipe 4, and the inlet of the hot water storage tank 1 is connected to the water outlet of the heating device 3 through a heating inlet pipe 5; a circulating pump 6 is arranged on the heating outlet pipe 4; the temperature control outlet of the hot water storage tank 1 is connected to the inlet of the heat pump unit 2 through a temperature control outlet pipe 7, and the temperature control inlet of the hot water storage tank 1 is connected to the outlet of the heat pump unit 2 through a temperature control inlet pipe 8; both the heat pump unit 2 and the hot water storage tank 1 are provided with There is a temperature sensor; a plurality of heat pump circulation pump groups 17 are arranged in parallel on the temperature control outlet pipe 7; each heat pump circulation pump group 17 includes a front valve 9, a manual control valve 10, a heat pump circulation pump 11, a check valve 12 and a rear valve 13 from the front end to the rear end; a valve 14 is arranged on the temperature control inlet pipe 8; the heat storage water tank 1 is also provided with a water outlet and a water inlet, the water outlet is connected to the inlet of the geothermal pipe 16 in the greenhouse, and the water inlet is connected to the outlet of the geothermal pipe 16 in the greenhouse, and a circulation pump 6 is arranged on the pipe connecting the geothermal pipe 16 and the water inlet.

[0022] The manual control valve 10 and the heat pump circulation pump 11 , the heat pump circulation pump 11 and the check valve 12 , the rear end valve 13 and the heat pump inlet, and the valve 14 and the heat pump outlet are all connected via rubber flexible joints 15 .

[0023] The valve 14, the front valve 9 and the rear valve 13 are all gate valves. The heat pump unit 2 is an air-cooled screw heat pump unit. The heating device 3 is a solar heating device. The solar heating device includes a plurality of solar heating tube groups, each solar heating tube group includes 20 solar heating tubes. There are two hot water storage tanks 1, each of which is connected to a group of heating devices 3. The two hot water storage tanks 1 are connected in parallel.

[0024] When the environment drops below 0°C, the lower the ambient temperature, the lower the efficiency of the heat pump unit 2 will be by 3%-10%. Similarly, the efficiency of a heat pump unit 2 can reach more than 3.6 when the ambient temperature is 10°C, and only about 2.6 when the ambient temperature is -10°C. The heat storage function of the heat storage tank 1 is used to keep the operating ambient temperature of the heat pump unit 2 in the high efficiency range; under the condition of high ambient temperature, the operating efficiency of the heat pump unit 2 is fully utilized to avoid the heat pump unit 2 operating in the lowest ambient temperature for a long time, so as to save energy.

[0025] The greenhouse design temperature is not less than 15℃. In winter, when there is sunshine during the day, the temperature in the greenhouse will be higher than 15℃. At night, the temperature of the greenhouse will decrease with the ambient temperature. In extreme cases, the temperature of the greenhouse will drop to -10℃. In terms of control logic, the control logic of ambient temperature priority, water tank temperature priority, and greenhouse temperature priority is made: when the temperature in the greenhouse is higher than 15℃, the circulation pump 6 on the geothermal pipe 16 stops running, and when the temperature in the greenhouse is lower than 18℃, the circulation pump 6 on the geothermal pipe 16 starts running; when the ambient temperature is higher than 15℃, the entire system stops running, and when the ambient temperature is lower than 12℃ (the temperature in the greenhouse is still higher than 15℃), the heat pump unit 2 starts running until the temperature of the hot water storage tank 1 reaches the target setting value of 45℃, and the heat pump unit 2 stops running. Due to the heat storage effect of the hot water storage tank 1 (when the heat pump unit 2 is not working, it can ensure continuous operation for 2-3 hours, and the greenhouse temperature is not lower than 15℃), even if the heat pump unit 2 defrosts, the temperature of the entire system can meet the design requirements, avoiding long-term operation under extreme temperatures.

[0026] The utility model adds a hot water storage tank 1 between the heat pump unit 2 and the geothermal pipe 16. The temperature buffer of the hot water storage tank 1 prevents the heat pump unit 2 from increasing its load when the temperature difference between the inlet and outlet water is too large, and fails to maintain the best unit efficiency, thereby effectively increasing the practical life of the equipment and effectively saving energy. The temperature sensors provided in the hot water storage tank 1 and the heat pump unit 2 are used to optimize the control logic, reasonably plan the operation time of the heat pump unit 2, and avoid energy waste.

[0027] Finally, it should be noted that the above examples are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and there are many variations. All variations that can be directly derived or associated with the content disclosed by a person skilled in the art from the present invention should be considered as the protection scope of the present invention.

Claims

1. A greenhouse temperature control system, characterized in that: It includes a hot water storage tank, a heat pump unit, a heating device and a geothermal pipeline; the heating outlet of the hot water storage tank is connected with the water inlet of the heating device through a heating outlet pipeline, and the inlet of the hot water storage tank is connected with the water outlet of the heating device through a heating inlet pipe; a circulating pump is arranged on the heating outlet pipe; the temperature control outlet of the hot water storage tank is connected with the inlet of the heat pump unit through a temperature control outlet pipe, and the temperature control inlet of the hot water storage tank is connected with the outlet of the heat pump unit through a temperature control inlet pipe; temperature sensors are arranged in the heat pump unit and the hot water storage tank; a plurality of heat pump circulation pump groups are arranged in parallel on the temperature control outlet pipe; each heat pump circulation pump group includes a front valve, a manual control valve, a heat pump circulation pump, a check valve and a rear valve from the front end to the rear end; a valve is arranged on the temperature control inlet pipe; the hot water storage tank is also provided with a water outlet and a water inlet, the water outlet is connected with the inlet of the geothermal pipeline in the greenhouse, the water inlet is connected with the outlet of the geothermal pipeline in the greenhouse, and a circulating pump is arranged on the pipe connecting the geothermal pipeline and the water inlet.

2. A greenhouse temperature control system as claimed in claim 1, characterized in that: The manual control valve and the heat pump circulation pump, the heat pump circulation pump and the check valve, the rear end valve and the heat pump inlet, and the valve and the heat pump outlet are all connected through rubber flexible joints.

3. A greenhouse temperature control system as claimed in claim 1, characterized in that: The valve, the front valve and the rear valve are all gate valves.

4. A greenhouse temperature control system as claimed in claim 1, characterized in that: The heat pump unit is an air-cooled screw heat pump unit.

5. A greenhouse temperature control system as claimed in claim 1, characterized in that: The heating device is a solar heating device.

6. A greenhouse temperature control system as claimed in claim 5, characterized in that: The solar heating device comprises a plurality of solar heating tube groups, each of which comprises 20 solar heating tubes.

7. A greenhouse temperature control system as claimed in claim 1, characterized in that: There are two hot water storage tanks, and each of the hot water storage tanks is connected to a group of heating devices.

8. A greenhouse temperature control system as claimed in claim 7, characterized in that: The two hot water storage tanks are connected in parallel.

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